WO2004058554A1 - Device for measuring the roundness of a railroad wheel - Google Patents

Device for measuring the roundness of a railroad wheel Download PDF

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Publication number
WO2004058554A1
WO2004058554A1 PCT/EP2003/014480 EP0314480W WO2004058554A1 WO 2004058554 A1 WO2004058554 A1 WO 2004058554A1 EP 0314480 W EP0314480 W EP 0314480W WO 2004058554 A1 WO2004058554 A1 WO 2004058554A1
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WO
WIPO (PCT)
Prior art keywords
wheel
measuring
railway
rail
measuring device
Prior art date
Application number
PCT/EP2003/014480
Other languages
German (de)
French (fr)
Inventor
Alfred Heimann
Original Assignee
Hegenscheidt-Mfd Gmbh & Co. Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hegenscheidt-Mfd Gmbh & Co. Kg filed Critical Hegenscheidt-Mfd Gmbh & Co. Kg
Priority to AU2003300532A priority Critical patent/AU2003300532A1/en
Priority to US10/540,343 priority patent/US7392595B2/en
Priority to DE50304173T priority patent/DE50304173D1/en
Priority to EP03813898A priority patent/EP1575816B1/en
Publication of WO2004058554A1 publication Critical patent/WO2004058554A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00—Testing of vehicles
    • G01M17/08—Railway vehicles
    • G01M17/10—Suspensions, axles or wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61K—AUXILIARY EQUIPMENT SPECIALLY ADAPTED FOR RAILWAYS, NOT OTHERWISE PROVIDED FOR
    • B61K9/00—Railway vehicle profile gauges; Detecting or indicating overheating of components; Apparatus on locomotives or cars to indicate bad track sections; General design of track recording vehicles
    • B61K9/12—Measuring or surveying wheel-rims

Definitions

  • Measuring device for measuring the roundness of a
  • the invention relates to a measuring device on at least one rail, a railroad track for measuring the roundness of a single railroad wheel or the railroad wheels of a wheel set while it is running over the rail as the difference between the circumferential radius of the wheel flange tip and the radius of the running surface of the railroad wheel in a measuring plane.
  • the roundness of a railway wheel is a criterion for the comfort of the railway vehicle.
  • Non-round wheels stimulate natural vibrations of the vehicle, the bogie or the body, which passengers perceive as unpleasant noise and vibrations.
  • the causes for the roundness of the railway wheels are complex and result from the running of the wheel tread on the rail. Out-of-roundness does not just occur per wheel revolution, polygons with 3, 6 times or more numbers per revolution have also been found.
  • Critical runout values for a railway wheel are measured over the entire circumference in the order of 0.5 mm as the difference between two radii in the same wheel plane.
  • Braking with blocking can create flat spots on the tread of the railway wheel. These are typically only short, for example 50 mm long, but deep in comparison to out-of-roundness, ie flat spots have depths between 0.5 mm and more the tread. In contrast, the wheel flange practically does not wear on its outer circumference; at most there is little wear on tram wheels. It is therefore necessary to monitor the roundness of railway wheels.
  • the known measuring station has two parallel rails, each of which is assigned to one of the railroad wheels and is composed of a series of measuring chains, each of which is assigned measuring devices which have sensors.
  • the known measuring station consists of a mechanical subsystem, an electronic subsystem and a compressed air subsystem.
  • the mechanical subsystem is formed by a plate which carries devices which control potentiometric displacement sensors, four or more per track, which correspond to the wheel diameter, wheel flange thickness, wheel flange height, wheel flange angle and the distance between wheel treads.
  • the electronic subsystem consists of potentiometric sensors and the
  • the compressed air system creates an air passage to compressed air cylinders, which move the sensors vertically when a vehicle drives over them.
  • the entirety of the individual devices of the known measuring station is housed in a waterproof protective housing made of metal, which makes it possible to operate the measuring station outdoors.
  • the well-known The measuring station is always in the wheel arch direction in order to keep three measuring points in contact with the railway wheel as long as possible. With the known measuring station, the roundness and also the flat spots of railroad wheels are determined with the aid of a measuring bar, referred to in the cited patent as measuring bar (14).
  • the measuring bar scans the surface of the wheel flange relative to the rail and eats the displacement of the wheel tread surface to the wheel flange as a measured variable.
  • the object of the present invention is therefore to measure the concentricity and flatness of a railway wheel in such a way that both the influence of the weight acting on the railway wheel and the influences of temperatures play a negligible role.
  • the associated measuring device should be simple in structure and require little maintenance.
  • the object is achieved by a measuring device which is arranged within a measuring section along the rail of a railroad track and from a plurality consists of individual sensors, which are each at a lateral distance from each other and are connected to the rail in the measuring plane along the axis of rotation of the railroad wheel or wheel set and perpendicular to the footprint of the respective railroad wheel.
  • the railway wheel runs with its tread on a standard rail.
  • Such rails are e.g. standardized according to UIC 60 or S 54 standards.
  • the choice of a straight lead section before the start of the measuring section means that the railroad wheel or the wheel set with its two railroad wheels only moves very little across the measuring section transversely to the rail.
  • the measuring distance ' is usually between one and two revolutions of the railway wheel. Since the tread of the railroad wheel is known to have a conical profile, such a shift would have an effect on the measurement result as a measurement error.
  • Several sensors are arranged along the measuring section. These are attached to the rail with their base, and the sensor touching the wheel flange of the railway wheel measures in the measurement plane of the sensor attachment.
  • the sensor thus correctly measures the flange height when the wheel with its contact point is exactly in the measuring plane, which is perpendicular to the contact plane of the wheel tread on the track and runs through the axis of rotation of the railway wheel.
  • the respective footprint of a railway wheel on the rail is approximately the size of the diameter of a pea. In levels in front of and behind the measuring level, the load of the railway wheel will bend the rail relative to the measuring level, so that there is a measurement error that depends on the wheel load, rail stiffness and is dependent on the support conditions of the rail and sleeper on the ballast.
  • a single sensor can measure the flange height of only one point on the wheel circumference.
  • several sensors are arranged along the rails within the specified measuring section. With a measuring section corresponding to the wheel circumference and with an expected “triangle formation” for the wheel shape, at least six measuring sensors will therefore be provided.
  • the mutual distance between two sensors can be determined by calculation according to the largest measuring path and the smallest diameter of the railway wheel to be measured. Assuming a wheel of 600 mm pitch circle diameter and a measuring range of 30 mm of the probe, then a mutual distance of 'single probe of about 300 mm results.
  • Each sensor consists of a measuring lever, which as a button for touching the railway wheel on the circumference of the wheel flange carries a roller with high accuracy. This role is to reduce wear due to relative movements and falsification of the measured values due to frictional forces.
  • the roller sits at one end of a precisely guided measuring lever, the axis of rotation of which carries an angle measuring system of high resolution.
  • the roll of the measuring lever is pressed against the wheel flange by a return spring.
  • the mass of the measuring lever and the roller are as small as possible, stiffness as large as possible. Since the measuring force should change as little as possible during a measurement, the return spring used to generate the force must have a soft characteristic.
  • the sensor is in the measuring plane, namely where the sensing roller is located, and is only rigidly connected to the rail at this point.
  • a calibration stop is also provided in the measuring plane, which allows all sensors to have the same zero point, regardless of the thermal deformation of the respective measuring lever.
  • the railroad wheel will accelerate the roll with the first touch of the sensor. An empty travel is therefore provided in order to calm the sensor due to its natural or additional damping and friction.
  • the return spring must exert sufficient measuring force to overcome minor contamination of the flanged tip. If necessary, a system for cleaning the wheel flange can be connected upstream of the measuring section.
  • the force of the return spring must ensure the acceleration of the measuring lever behind the apex of the railway wheel. The force of the acceleration can be determined from the inertia of the measuring lever and the feeler roller as well as the wheel diameter and the speed of the railway wheel.
  • the measuring section of all twelve sensors, for example within the measuring section of a track, are recorded at high frequency.
  • the frequency depends on the resolution required for the out-of-roundness and is in turn determined by the diameter and Speed of the railway wheel. In addition, the frequency must be so high that the shortest flat point can be detected with three points.
  • the diameter of the tread and the flange of the railroad wheel can be determined.
  • the measurement result is falsified by the influence of the load on the railway wheel, so one corrects e.g. with a medium load.
  • the accuracy of the calculation of the diameter of the railway wheel can be increased by taking into account all data pairs of all sensors (with the exception of measuring ranges that are falsified by flat spots) in the calculation.
  • the out-of-roundness of the railway wheel determined after the measurement can be corrected again in the calculation process and the accuracy of the calculation of the diameter can thus be increased.
  • the speed of the railroad wheel can be calculated from the signals of a single sensor with a calculated final diameter of the tread of the railroad wheel or from the time interval that arises until two adjacent sensors were able to measure the flange height.
  • the measurement values of the sensors can now be converted in such a way that they result in a continuous rotation.
  • the result is falsified by systematic errors, such as the axle load, and random errors.
  • systematic errors such as the axle load, and random errors.
  • a somewhat less precise representation naturally results from the source signal.
  • the measurement signal is less distorted when the contact point of the railway wheel is in the vicinity of the measurement plane.
  • the calculated "continuous runout" is therefore more precise and can at least be used to determine a tangent to the runout curve of the railway wheel in the measurement plane. Knowing the track diameter of the railway wheel allows the measurement values that go beyond one revolution for a
  • Polar diagram representation "wheel flange height difference over the angle of rotation of the ice rink wheel” to use.
  • the measurement error which arises from an axial wheel movement across the rail across the cone shape of the tread of the railroad wheel, can be reduced by taking the measured values of the angle 0 ° and just before and adjusts each other shortly after 360 ° by linear interpolation and thus has a correction for the measured values of the intermediate sensors.
  • Analogue or digital measuring devices such as encoders, incremental, linear scales or magnetostrictive methods, for which there are numerous manufacturers, can be used for specific measuring paths of 40 mm with resolution below 5 ⁇ .
  • the invention is described in more detail below using an exemplary embodiment.
  • FIG. 1 shows the position of a railroad wheel on a rail
  • FIG. 2 the scanning of the wheel flange of a railroad wheel running over the rail
  • FIG. 4 shows the sensor of FIG. 3 in a front view
  • FIG. 5 shows a travel time diagram of a sensor
  • Fig. 1 shows a railway wheel 1 at a moment where it rolls with its tread 2 in the direction 3 on a rail 4.
  • a track which is known to consist of two parallel and spaced rails 4, the railway wheel 1 is held by the flange 5.
  • the railway wheel 1 rotates about its axis of rotation 6, which is perpendicular to the image plane of FIG. 1.
  • 1 shows, for example, the out-of-roundness 7 of a railway wheel 1.
  • the runout 7 corresponds to the difference between the flange heights 8 and 9, for example measured in the plane of the axis of rotation 6 in the direction of travel 3.
  • FIG. 1 shows a railway wheel 1 at a moment where it rolls with its tread 2 in the direction 3 on a rail 4.
  • the railway wheel 1 is held by the flange 5.
  • the railway wheel 1 rotates about its axis of rotation 6, which is perpendicular to the image plane of FIG. 1.
  • 1 shows, for example, the out-of-roundness 7 of a railway wheel 1.
  • the contact surface 10 of the railway wheel 1 is offset by the amount of runout 7 relative to the wheel axis 6 ,
  • the contact area 10 is shown as a white point within a black frame 11 in FIG. 2.
  • the black frame 11 illustrates the Size of a flat spot in relation to the normal contact area 10 of a railway wheel 1 on a rail 4.
  • the railroad wheel 1 of FIG. 2 rolling in the running direction 3 on the rail 4 is touched on the wheel flange 5 by a plurality of sensors 12.
  • Each sensor 12 consists of a measuring lever 13, at the outer end of which a measuring roller 14 is attached.
  • the sensors 2 with their sensing rollers 14 each take different horizontal positions 15 when they touch the wheel flange 5 of the railway wheel 1 in accordance with the distance traveled in the running direction 3.
  • the horizontal positions 15 of the feeler rollers 14 correspond to the measuring path.
  • Each sensor 12 (FIG. 3, FIG. 4) consists of a base 16 which is fastened to the rail 4 in the measuring plane 17.
  • the measuring plane 17 corresponds to the plane which runs on the track 4 perpendicular to the standing surface 10 and parallel to the wheel axis 6.
  • the measuring lever 13 is rotatably connected to the base 16 via a swivel joint 18. At the same time, the measuring lever 13 is supported on the base 16 via a return spring 19.
  • FIG. 5 shows the signal of a sensor 12 over time at different speeds of the railroad wheel 1 in the direction of movement 3.
  • the signal 21 corresponds to a slow running of the railroad wheel 1
  • the curve 22 corresponds to a fast running of the railroad wheel 1.
  • Section 24 in 5 corresponds to the measuring path which is covered by the individual measuring sensors 12 when the wheel flange 5 is rolled over.
  • a plurality of measurement curves 23 are arranged next to one another over a measurement section 25, as they correspond to the signals 26 of the individual measurement sensors 12.
  • the measuring section 25 is somewhat larger than the wheel circumference 27, which a railway wheel 1 travels with a single revolution.
  • the signals -26 are each of different lengths. Tangents, applied to the measurement curves 23, result in an approximately sinusoidal curve 28.
  • This curve 28 corresponds to the measured out-of-roundness of the railway wheel 1 over a circumference of the wheel tread 2.
  • the envelope curve 28 also has an increase 29.
  • the increase 29 represents the Transverse movement of the railway wheel 1 when rolling on the track in the direction of the axis of rotation 6.
  • the measurement signal 30 of FIG. 7 shows an indentation 31.
  • the indentation 31 originates from a flat point 11, which was determined on the tread 2 of the railway wheel 1.
  • An isolated representation 32 of the flat point 11 with regard to its position and depth on the circumference of the tread 2 can then be seen in FIG. 8. 2004 0 12

Abstract

The invention relates to a measuring device which is disposed on at least one rail (4) of a railroad track and measures the roundness (7) of an individual railroad wheel (1) as the difference (8 - 9) between the circumferential radius of the wheel flange top (5) and the radius of the running tread (2) of the railroad wheel (1) on a measurement plane (17) when said railroad wheel (1) travels (3) across the rail (4). Said measuring device comprises a plurality of sensors that are placed at a lateral distance from each other and are connected to the rail (4) perpendicular to the contact area (10) between the respective railroad wheel (1) and the rail (4) along the rotating axle (6) of the railroad wheel (1) or wheel set on the measurement plane (17).

Description

Messeinrichtung zum Messen der Rundheit eines Measuring device for measuring the roundness of a
EisenbahnradesRailway wheel
Die Erfindung betrifft eine Messeinrichtung an wenigstens einer Schiene, eines Eisenbahngleises zum Messen der Rundheit eines einzelnen Eisenbahnrades oder der Eisenbahnräder eines Radsatzes während dessen Laufs über die Schiene als Differenz des Umfangsradius der Spurkranzkuppe und des Radius der Lauffläche des Eisenbahnrades in einer Messebene-The invention relates to a measuring device on at least one rail, a railroad track for measuring the roundness of a single railroad wheel or the railroad wheels of a wheel set while it is running over the rail as the difference between the circumferential radius of the wheel flange tip and the radius of the running surface of the railroad wheel in a measuring plane.
Die Rundheit eines Eisenbahnrades ist ein Kriterium für den Komfort des Eisenbahnfahrzeugs. .Unrunde Räder regen Eigenschwingungen des Fahrzeugs, des Drehgestells oder des Wagenkastens an, die von den Fahrgästen als unangenehmes Geräusch und Schwingungen empfunden werden. Die Ursachen zum Unrundwerden der Eisenbahnräder -sind komplex und resultieren aus dem Lauf der Radlauffläche auf der Schiene. Unrundheiten treten nicht nur einfach je Radumdrehung auf, es sind auch Polygone mit 3-, 6-facher und höherer Zahl pro Umdrehung festgestellt worden. Kritische Rundlaufwerte für ein Eisenbahnrad liegen über dem gesamten Umfang gemessen in der Größenordnung von 0,5 mm als Differenz zweier Radien in der selben Radebene.The roundness of a railway wheel is a criterion for the comfort of the railway vehicle. Non-round wheels stimulate natural vibrations of the vehicle, the bogie or the body, which passengers perceive as unpleasant noise and vibrations. The causes for the roundness of the railway wheels are complex and result from the running of the wheel tread on the rail. Out-of-roundness does not just occur per wheel revolution, polygons with 3, 6 times or more numbers per revolution have also been found. Critical runout values for a railway wheel are measured over the entire circumference in the order of 0.5 mm as the difference between two radii in the same wheel plane.
Durch Bremsvorgänge mit Blockierung können sich Flachstellen auf der Lauffläche des Eisenbahnrades bilden. Diese sind typischerweise nur kurz, z.B. 50 mm lang, aber im Vergleich zur Unrundheit tief, d.h. Flachstellen weisen Tiefen zwischen 0,5 mm und mehr auf der Lauffläche auf. Demgegenüber verschleißt der Spurkranz auf seinem Außenumfang praktisch nicht; allenfalls bei Straßenbahnrädern gibt es einen geringen Verschleiß. Es ist deshalb erforderlich, die Rundheit von Eisenbahnrädern zu überwachen.Braking with blocking can create flat spots on the tread of the railway wheel. These are typically only short, for example 50 mm long, but deep in comparison to out-of-roundness, ie flat spots have depths between 0.5 mm and more the tread. In contrast, the wheel flange practically does not wear on its outer circumference; at most there is little wear on tram wheels. It is therefore necessary to monitor the roundness of railway wheels.
Beispielsweise ist aus der DE 693 05 664 T2 eine Messstation zum Kontrollieren von Eisenbahnfahrzeugrädern bekannt geworden. Die bekannte Messstation hat zwei parallele Schienen, von denen jede einem der Eisenbahnräder zugeordnet ist und aus einer Reihe von Messketten zusammengesetzt ist, denen jeweils Messgeräte zugeordnet sind, welche Messfühler aufweisen. Die bekannte Messstation besteht aus einem mechanischen- Untersystem, einem elektronischen Untersystem und einem Druckluftuntersystem. Das mechanische Untersystem wird von einer Platte gebildet, welche Einrichtungen trägt, die potentiometrische Verschiebungssensoren steuern, vier oder mehr pro Gleisstrang, die dem Raddurchmesser, der Spurkranzdicke, der Spurkranzhöhe, dem Spurkranzwinkel und dem Abstand zwischen Radlaufflächen entsprechen. Das elektronische Untersystem setzt sich aus potentiometrischen Sensoren und derFor example, from DE 693 05 664 T2 a measuring station for checking railway vehicle wheels has become known. The known measuring station has two parallel rails, each of which is assigned to one of the railroad wheels and is composed of a series of measuring chains, each of which is assigned measuring devices which have sensors. The known measuring station consists of a mechanical subsystem, an electronic subsystem and a compressed air subsystem. The mechanical subsystem is formed by a plate which carries devices which control potentiometric displacement sensors, four or more per track, which correspond to the wheel diameter, wheel flange thickness, wheel flange height, wheel flange angle and the distance between wheel treads. The electronic subsystem consists of potentiometric sensors and the
Verarbeitungselektronik zusammen, wobei das elektronische Untersystem mit einem Computer in Verbindung steht und eine elektronische Verarbeitungseinheit enthält, die wiederum signalverarbeitende Einheiten enthält. Das Druckluftsystem schafft einen Luftdurchgang zu Druckluftzylindern, welche die Messfühler senkrecht verschieben, wenn ein Fahrzeug darüber fährt. Die Gesamtheit der einzelnen Vorrichtungen der bekannten Messstation ist in einem wasserdichten Schutzgehäuse .aus Metall untergebracht, wodurch es möglich wird, die Messstation auch im Freien zu betreiben. Die bekannte Messstation liegt grundsätzlich in der Radlaufrichtung, um drei Messpunkte so lange wie möglich mit dem Eisenbahnrad in Kontakt zu halten. Mit der bekannten Messstation werden die Rundheit und auch die Flachstellen von Eisenbahnrädern mit Hilfe eines Messbalkens, in der zitierten Patentschrift als Messbalken (14) bezeichnet, ermittelt. Der Messbalken tastet die Oberfläche der Spurkranzkuppe relativ zur Schiene ab und isst als Messgröße die Verlagerung der Radlauffläche zur Spurkranzkuppe. Dazu ist es erforderlich, die beiden an der Messung beteiligten Komponenten Schiene und Messbalken sehr steif zu gestalten, um auf diese Weise systematische Fehler, die durch das Gewicht des Fahrzeugs entstehen, das auf das Eisenbahnrad wirkt, möglichst klein zu halten. Dies führt bekanntermaßen zu steifen Konstruktionen und kostenaufwendigen Fundamenten. Darüber hinaus uss verhindert werden, dass sich Fundament und Messbalken durch thermische Einflüsse, z.B. durch Sonneneinstrahlung, welche auf ein im Freien befindliches Eisenbahngleis wirkt, zwischen zwei Kalibrierzyklen merklich zueinander verlagern.Processing electronics together, wherein the electronic subsystem is connected to a computer and contains an electronic processing unit, which in turn contains signal processing units. The compressed air system creates an air passage to compressed air cylinders, which move the sensors vertically when a vehicle drives over them. The entirety of the individual devices of the known measuring station is housed in a waterproof protective housing made of metal, which makes it possible to operate the measuring station outdoors. The well-known The measuring station is always in the wheel arch direction in order to keep three measuring points in contact with the railway wheel as long as possible. With the known measuring station, the roundness and also the flat spots of railroad wheels are determined with the aid of a measuring bar, referred to in the cited patent as measuring bar (14). The measuring bar scans the surface of the wheel flange relative to the rail and eats the displacement of the wheel tread surface to the wheel flange as a measured variable. To do this, it is necessary to make the two components rail and measuring beam involved in the measurement very rigid, in order to keep systematic errors caused by the weight of the vehicle acting on the railway wheel as small as possible. As is well known, this leads to rigid constructions and costly foundations. In addition, it must be prevented that the foundation and the measuring bar are noticeably displaced between thermal calibration effects, for example by solar radiation, which acts on a railway track located outdoors, between two calibration cycles.
Aufgabe der vorliegenden Erfindung ist es daher, den Rundlauf und Flachstellen eines Eisenbahnrades in der Weise zu messen, dass sowohl der Einfluss des auf das Eisenbahnrad wirkenden Gewichts als auch die Einflüsse von Temperaturen eine vernachlässigbare Rolle spielen. Darüber hinaus soll die zugehörigen Messeinrichtung einfach in ihrem Aufbau sein und wenig Aufwand bei der Wartung erfordern.The object of the present invention is therefore to measure the concentricity and flatness of a railway wheel in such a way that both the influence of the weight acting on the railway wheel and the influences of temperatures play a negligible role. In addition, the associated measuring device should be simple in structure and require little maintenance.
Die Aufgabe wird von einer Messeinrichtung gelöst, welche innerhalb einer Messstrecke entlang der Schiene eines Eisenbahngleises angeordnet ist und aus einer Mehrzahl von einzelnen Messfühlern besteht, die jeweils einen seitlichen Abstand voneinander haben und in der Messebene längs der Drehachse des Eisenbahnrades bzw. des Radsatzes und senkrecht zur AufStandsfläche des jeweiligen Eisenbahnrades mit der Schiene verbunden sind.The object is achieved by a measuring device which is arranged within a measuring section along the rail of a railroad track and from a plurality consists of individual sensors, which are each at a lateral distance from each other and are connected to the rail in the measuring plane along the axis of rotation of the railroad wheel or wheel set and perpendicular to the footprint of the respective railroad wheel.
Das Eisenbahnrad läuft mit seiner Lauffläche auf einer bahnüblichen Profilschiene ab. Solche Schienen sind z.B. nach den Normen UIC 60 oder S 54 genormt. Durch die Wahl einer geraden Vorlaufstrecke vor Beginn der Messstrecke wird erreicht, dass sich das Eisenbahnrad bzw. der Radsatz mit seinen beiden Eisenbahnrädern nur sehr wenig quer zur Schiene über die Messstrecke verlagert. Die Messstrecke' beträgt in der Regel zwischen ein bis zwei Umdrehungen des Eisenbahnrades. Da die Lauffläche des Eisenbahnrades bekanntermaßen ein kegliges Profil hat, würde sich eine derartige Verlagerung als Messfehler auf das Messergebnis auswirken.The railway wheel runs with its tread on a standard rail. Such rails are e.g. standardized according to UIC 60 or S 54 standards. The choice of a straight lead section before the start of the measuring section means that the railroad wheel or the wheel set with its two railroad wheels only moves very little across the measuring section transversely to the rail. The measuring distance 'is usually between one and two revolutions of the railway wheel. Since the tread of the railroad wheel is known to have a conical profile, such a shift would have an effect on the measurement result as a measurement error.
Entlang der Messstrecke werden mehrere Messfühler angeordnet. Diese sind mit ihrer Basis an der Schiene befestigt, und der die Spurkranzkuppe des Eisenbahnrades berührende Messfühler misst jeweils in der Messebene der Befestigung des Messfühlers. Der Messfühler misst somit dann fehlerfrei die Spurkranzhöhe, wenn sich das Rad mit seinem Aufstandspunkt genau in der Messebene befindet, welche senkrecht auf der Aufstandsebene der Radlauffläche auf dem Gleis steht und durch die Drehachse des Eisenbahnrades verläuft. Die jeweilige Aufstandsfläche eines Eisenbahnrades auf der Schiene hat annähernd die Größe des Durchmessers einer Erbse. In Ebenen vor und hinter der Messebene wird die Last des Eisenbahnrades die Schiene relativ zur Messebene verbiegen, so dass sich ein Messfehler ergibt, der von der Radlast, Schienensteife und den Auflagerbedingungen der Schiene und Schwelle auf dem Schotter abhängig ist.Several sensors are arranged along the measuring section. These are attached to the rail with their base, and the sensor touching the wheel flange of the railway wheel measures in the measurement plane of the sensor attachment. The sensor thus correctly measures the flange height when the wheel with its contact point is exactly in the measuring plane, which is perpendicular to the contact plane of the wheel tread on the track and runs through the axis of rotation of the railway wheel. The respective footprint of a railway wheel on the rail is approximately the size of the diameter of a pea. In levels in front of and behind the measuring level, the load of the railway wheel will bend the rail relative to the measuring level, so that there is a measurement error that depends on the wheel load, rail stiffness and is dependent on the support conditions of the rail and sleeper on the ballast.
Zunächst kann ein einzelner Messfühler die Spurkranzhöhe nur eines Punktes am Radumfang messen. Gemäß der Charakteristik der Unrundheit, oval oder Polygon, werden längs der Schienen innerhalb der vorgegebenen Messstrecke mehrere Messfühler angeordnet. Bei einer Messstrecke entsprechend dem Radumfang und bei einer erwarteten „Dreiecksbildung" für die Radform wird man deshalb mindestens sechs Messfühler vorsehen.First, a single sensor can measure the flange height of only one point on the wheel circumference. According to the characteristic of ovality, oval or polygon, several sensors are arranged along the rails within the specified measuring section. With a measuring section corresponding to the wheel circumference and with an expected “triangle formation” for the wheel shape, at least six measuring sensors will therefore be provided.
Wichtig für die Anordnung der Messfühler innerhalb der Messstrecke ist es, dass mindestens immer ein Messfühler am Spurkranz messend anliegen muss. Dies ist zum Messen von Flachstellen erforderlich. Entsprechend dem größten Messweg und dem kleinsten Durchmesser des zu vermessenden Eisenbahnrades kann der gegenseitige Abstand zweier Messfühler rechnerisch bestimmt werden. Nimmt man ein Rad von 600 mm Laufkreisdurchmesser und einen Messbereich von 30 mm des Messfühlers, so ergibt sich ein gegenseitiger Abstand der' einzelnen Messfühler von etwa 300 mm.It is important for the arrangement of the sensors within the measuring section that at least one sensor must always be in contact with the flange. This is necessary for measuring flat spots. The mutual distance between two sensors can be determined by calculation according to the largest measuring path and the smallest diameter of the railway wheel to be measured. Assuming a wheel of 600 mm pitch circle diameter and a measuring range of 30 mm of the probe, then a mutual distance of 'single probe of about 300 mm results.
Jeder Messfühler besteht aus einem Messhebel, der als Taster zum Berühren des Eisenbahnrades auf dem Umfang der Spurkranzkuppe jeweils eine mit großer Genauigkeit Wälzgelagerte Rolle trägt. Diese Rolle soll Verschleiß durch Relativbewegungen und Verfälschungen der Messwerte durch Reibkräfte verringern. Die Rolle sitzt an einem Ende eines genau geführten Messhebels, dessen Drehachse ein Winkelmesssystem von hoher Auflösung trägt. Die Rolle des Messhebels wird durch eine Rückholfeder an die Spurkranzkuppe gedrückt. Als bewegtes Teil werden die Masse des Messhebels und der Rolle so klein wie möglich, die Steifigkeit so groß wie möglich ausgeführt. Da sich die Messkraft während einer Messung möglichst wenig ändern soll, muss die zur Krafterzeugung verwendete Rückholfeder eine weiche Kennlinie haben.Each sensor consists of a measuring lever, which as a button for touching the railway wheel on the circumference of the wheel flange carries a roller with high accuracy. This role is to reduce wear due to relative movements and falsification of the measured values due to frictional forces. The roller sits at one end of a precisely guided measuring lever, the axis of rotation of which carries an angle measuring system of high resolution. The roll of the measuring lever is pressed against the wheel flange by a return spring. As a moving part, the mass of the measuring lever and the roller are as small as possible, stiffness as large as possible. Since the measuring force should change as little as possible during a measurement, the return spring used to generate the force must have a soft characteristic.
Der Messfühler ist in der Messebene, nämlich dort wo die Tastrolle sitzt, und nur an dieser Stelle mit der Schiene steif verbunden. In der Messebene ist auch ein Kalibrieranschlag vorgesehen, der es erlaubt, für alle Messfühler einen gleichen Nullpunkt, unabhängig von der thermischen Verformung der jeweiligen Messhebel zu haben.The sensor is in the measuring plane, namely where the sensing roller is located, and is only rigidly connected to the rail at this point. A calibration stop is also provided in the measuring plane, which allows all sensors to have the same zero point, regardless of the thermal deformation of the respective measuring lever.
Das Eisenbahnrad wird bei der ersten Berührung des Messfühlers die Rolle stoßartig beschleunigen. Es ist deshalb, ein Leerweg vorgesehen, um den Messfühler durch seine natürliche oder zusätzliche Dämpfung und Reibung zu beruhigen.The railroad wheel will accelerate the roll with the first touch of the sensor. An empty travel is therefore provided in order to calm the sensor due to its natural or additional damping and friction.
Die Rückholfeder muss genügend Messkraft aufbringen, um kleinere Verunreinigungen der Spurkranzkuppe zu überwinden. Gegebenenfalls kann der Messstrecke eine Anlage zur Reinigung des Spurkranzes vorgeschaltet sein. Hinter dem Scheitelpunkt des Eisenbahnrades muss die Kraft der Rückholfeder die Beschleunigung des Messhebels gewährleisten. Die Kraft der Beschleunigung lässt sich aus der Trägheit des Messhebels und der Tastrolle sowie dem Raddurchmesser und der Geschwindigkeit des Eisenbahnrades bestimmen.The return spring must exert sufficient measuring force to overcome minor contamination of the flanged tip. If necessary, a system for cleaning the wheel flange can be connected upstream of the measuring section. The force of the return spring must ensure the acceleration of the measuring lever behind the apex of the railway wheel. The force of the acceleration can be determined from the inertia of the measuring lever and the feeler roller as well as the wheel diameter and the speed of the railway wheel.
Die Messstrecke aller zwölf Messfühler, beispielsweise innerhalb der Messstrecke eines Gleises, werden mit hoher Frequenz erfasst. Die Frequenz richtet sich nach der Auflösung, die für die Unrundheit benötigt wird und bestimmt sich wiederum über Durchmesser und Geschwindigkeit des Eisenbahnrades. Darüber hinaus muss die Frequenz so hoch sein, dass die kürzeste Flachstelle mit drei Punkten erfasst werden kann.The measuring section of all twelve sensors, for example within the measuring section of a track, are recorded at high frequency. The frequency depends on the resolution required for the out-of-roundness and is in turn determined by the diameter and Speed of the railway wheel. In addition, the frequency must be so high that the shortest flat point can be detected with three points.
Sobald das Eisenbahnrad mit zwei oder drei Messfuhlern gleichzeitig berührt wird und ein Messfühler die Spurkranzhöhe bestimmen konnte, dies ist im Ablauf zwangsläufig der Fall, können die Durchmesser der Lauffläche und der Spurkranzkuppe des Eisenbahnrades bestimmt werden. Das Messergebnis wird durch den Einfluss der Last des Eisenbahnrades verfälscht, daher korrigiert man z.B. mit einer mittleren Last. Die Genauigkeit der Berechnung des Durchmessers des Eisenbahnrades .kann noch dadurch gesteigert werden, dass man alle Datenpaare aller Messfühler (mit Ausnahme von Messbereichen, die durch Flachstellen verfälscht sind) in der Berechnung berücksichtigt. Man kann darüber hinaus die nach der Messung ermittelte Unrundheit des Eisenbahnrades wieder korrigierend in den Rechengang einführen und so die Genauigkeit der Berechnung des Durchmessers erhöhen. Weiterhin kann man sowohl aus den Signalen eines einzelnen Messfühlers bei berechnetem Enddurchmesser der Lauffläche des Eisenbahnrades oder aus dem zeitlichen Abstand, der entsteht, bis zwei angrenzende Messfühler die Spurkranzhöhe messen konnten, die Geschwindigkeit des Eisenbahnrades errechnen.As soon as the railroad wheel is touched with two or three sensors at the same time and a sensor was able to determine the flange height, this is inevitably the case in the process, the diameter of the tread and the flange of the railroad wheel can be determined. The measurement result is falsified by the influence of the load on the railway wheel, so one corrects e.g. with a medium load. The accuracy of the calculation of the diameter of the railway wheel can be increased by taking into account all data pairs of all sensors (with the exception of measuring ranges that are falsified by flat spots) in the calculation. In addition, the out-of-roundness of the railway wheel determined after the measurement can be corrected again in the calculation process and the accuracy of the calculation of the diameter can thus be increased. Furthermore, the speed of the railroad wheel can be calculated from the signals of a single sensor with a calculated final diameter of the tread of the railroad wheel or from the time interval that arises until two adjacent sensors were able to measure the flange height.
Mit Hilfe der Kreisgleichung und der Geschwindigkeit des Eisenbahnrades können nun die Messwerte der Messfühler in der Weise umgerechnet werden, dass sie einen kontinuierlichen Rundlauf ergeben. Durch systematische Fehler, beispielsweise die Radsatzlast, und zufällige Fehler ist das Ergebnis verfälscht. Es ist jedoch ausreichend, um aus den so behandelten Daten das Signal der Flachstelle sicher zu erkennen und deren Größe zu bestimmen. Eine etwas weniger genaue Darstellung ergibt sich naturgemäß aus dem Quellsignal.With the help of the circular equation and the speed of the railway wheel, the measurement values of the sensors can now be converted in such a way that they result in a continuous rotation. The result is falsified by systematic errors, such as the axle load, and random errors. However, it is sufficient to get the signal from the data treated in this way to reliably recognize the flat spot and determine its size. A somewhat less precise representation naturally results from the source signal.
Das Messsignal ist dann, .wenn sich der Aufstandspunkt des Eisenbahnrades in der Nähe der Messebene befindet, weniger verfälscht. In diesem Bereich ist somit der errechnete „kontinuierliche Rundlauf" genauer und kann zumindest zur Bestimmung einer Tangente an die Rundlaufkurve des Eisenbahnrades in der Messebene genutzt werden. Die Kenntnis des Laufkreisdurchmessers des Eisenbahnrades erlaubt es, die Messwerte, die über eine Umdrehung hinaus gehen, für eineThe measurement signal is less distorted when the contact point of the railway wheel is in the vicinity of the measurement plane. In this area, the calculated "continuous runout" is therefore more precise and can at least be used to determine a tangent to the runout curve of the railway wheel in the measurement plane. Knowing the track diameter of the railway wheel allows the measurement values that go beyond one revolution for a
Polardiagrammdarstellung, „Spurkranzhöhendifferenz über Drehwinkel des Eisbahnrades", zu nutzen. Der Messfehler, der durch eine axiale Radbewegung quer zur Schiene über die Kegelform der Lauffläche des Eisenbahnrades entsteht, kann verringert werden, in dem man die Messwerte des Winkels 0° und die kurz vor und kurz nach 360° liegenden Messwerte einander durch lineare Interpolation angleicht und somit eine Korrektur für die Messwerte der dazwischen liegenden Messfühler hat.Polar diagram representation, "wheel flange height difference over the angle of rotation of the ice rink wheel" to use. The measurement error, which arises from an axial wheel movement across the rail across the cone shape of the tread of the railroad wheel, can be reduced by taking the measured values of the angle 0 ° and just before and adjusts each other shortly after 360 ° by linear interpolation and thus has a correction for the measured values of the intermediate sensors.
Neben der konstruktiven Ausführung des Messfühlers als Schwinge mit Achse quer zur Schiene sind sinngemäß auch andere konstruktive Ausführungen wie lineare Führungen und schienen-parallele Drehpunkte möglich.In addition to the design of the sensor as a rocker arm with an axis transverse to the rail, other designs such as linear guides and pivot points parallel to the rail are also possible.
Es sind die für spezifische Messwege von 40 mm bei Auflösung unter 5 μ möglichen analogen oder digitalen Messmittel verwendbar, wie z.B. Encoder, incrementale, lineare Maßstäbe oder magnetostriktive Verfahren, für welche es zahlreiche Hersteller gibt. Nachfolgend wird die Erfindung an einem Ausführungsbeispiel näher beschrieben.Analogue or digital measuring devices, such as encoders, incremental, linear scales or magnetostrictive methods, for which there are numerous manufacturers, can be used for specific measuring paths of 40 mm with resolution below 5 μ. The invention is described in more detail below using an exemplary embodiment.
Es zeigen in stark vereinfachter teilweise schematischer Darstellung dieThey show the in a highly simplified, partially schematic representation
- Fig. 1 die Lage eines Eisenbahnrades auf einer Schiene, Fig. 2 das Abtasten der Spurkranzkuppe eines über die Schiene laufenden Eisenbahnrades,1 shows the position of a railroad wheel on a rail, FIG. 2 the scanning of the wheel flange of a railroad wheel running over the rail,
- Fig. 3 einen Messfühler in der Seitenansicht,3 is a side view of a sensor,
Fig. 4 den Messfühler der Fig. 3 in der Vorderansicht, Fig. 5 ein Wegzeitdiagramm eines Messfühlers,4 shows the sensor of FIG. 3 in a front view, FIG. 5 shows a travel time diagram of a sensor,
- Fig. 6 ein Wegzeitdiagramm mehrerer Messfühler innerhalb einer Messstrecke,6 shows a path-time diagram of several sensors within a measuring section,
- Fig. 7 eine Flachstelle in einem Rohsignal und7 shows a flat spot in a raw signal and
- Fig. 8 eine Flachstelle im Rundlauf.- Fig. 8 a flat spot in the concentric run.
Die Fig. 1 zeigt ein Eisenbahnrad 1 in einem Augenblick, wo es mit seiner Lauffläche 2 in der Richtung 3 auf einer Schiene 4 abrollt. In einem Gleis, welches bekanntlich aus zwei zueinander parallelen und beabstandeten Schienen 4 besteht, wird das Eisenbahnrad 1 vom Spurkranz 5 gehalten. Beim Lauf durch das Gleis dreht sich das Eisenbahnrad 1 um seine Drehachse 6, welche zur Bildebene der Fig. 1 senkrecht ist. In der Fig. 1 ist beispielsweise die Unrundheit 7 eines Eisenbahnrades 1 dargestellt. Die Unrundheit 7 entspricht der Differenz der Spurkranzhöhen 8 und 9 beispielsweise gemessen in der Ebene der Drehachse 6 in der Laufrichtung 3. Im vorliegenden Beispiel der Fig. 1 befindet sich die Aufstandsfläche 10 des Eisenbahnrades 1 um den Betrag der Unrundheit 7 gegenüber der Radachse 6 versetzt. Beispielsweise ist die Aufstandsfläche 10 als weißer Punkt innerhalb eines schwarzen Rahmens 11 in der Fig. 2 dargestellt. Der schwarze Rahmen 11 veranschaulicht die Größe einer Flachstelle im Verhältnis zur normalen Aufstandsfläche 10 eines Eisenbahnrades 1 auf einer Schiene 4.Fig. 1 shows a railway wheel 1 at a moment where it rolls with its tread 2 in the direction 3 on a rail 4. In a track, which is known to consist of two parallel and spaced rails 4, the railway wheel 1 is held by the flange 5. When running through the track, the railway wheel 1 rotates about its axis of rotation 6, which is perpendicular to the image plane of FIG. 1. 1 shows, for example, the out-of-roundness 7 of a railway wheel 1. The runout 7 corresponds to the difference between the flange heights 8 and 9, for example measured in the plane of the axis of rotation 6 in the direction of travel 3. In the present example in FIG. 1, the contact surface 10 of the railway wheel 1 is offset by the amount of runout 7 relative to the wheel axis 6 , For example, the contact area 10 is shown as a white point within a black frame 11 in FIG. 2. The black frame 11 illustrates the Size of a flat spot in relation to the normal contact area 10 of a railway wheel 1 on a rail 4.
Das in der Laufrichtung 3 auf der Schiene 4 abrollende Eisenbahnrad 1 der Fig. 2 wird an der Spurkranzkuppe 5 von mehreren Messfühlern 12 berührt. Jeder Messfühler 12 besteht aus einem Messhebel 13, an dessen äußeren Ende jeweils eine Messrolle 14 befestigt ist. Wie man in der Fig. 2 erkennen kann, nehmen die Messfühler 2 mit ihren Tastrollen 14 beim Berühren der Spurkranzkuppe 5 des Eisenbahnrades 1 entsprechend dem in der Laufrichtung 3 zurück gelegten Weg jeweils unterschiedliche horizontale Stellungen 15 ein. Die horizontalen Stellungen 15 der Tastrollen 14 entsprechen dem Messweg.The railroad wheel 1 of FIG. 2 rolling in the running direction 3 on the rail 4 is touched on the wheel flange 5 by a plurality of sensors 12. Each sensor 12 consists of a measuring lever 13, at the outer end of which a measuring roller 14 is attached. As can be seen in FIG. 2, the sensors 2 with their sensing rollers 14 each take different horizontal positions 15 when they touch the wheel flange 5 of the railway wheel 1 in accordance with the distance traveled in the running direction 3. The horizontal positions 15 of the feeler rollers 14 correspond to the measuring path.
Jeder Messfühler 12 (Fig. 3, Fig. 4) besteht aus einer Basis 16, die in der Messebene 17 mit der Schiene 4 befestigt ist. Die Messebene 17 entspricht der Ebene, welche auf dem Gleis 4 senkrecht zur AufStandsfläche 10 und parallel zur Radachse 6 verläuft. Mit der Basis 16 ist der Messhebel 13 über ein Drehgelenk 18 drehbar verbunden. Zugleich stützt sich der Messhebel 13 auf der Basis 16 über eine Rückholfeder 19 ab. In dem Drehgelenk 18 ist außerdem ein Winkelmessgeber 20 vorgesehen, der die jeweilige horizontale Stellung 15 der Messrolle 14 an der Spurkränz uppe 5 in der Messebene 17 ermittelt.Each sensor 12 (FIG. 3, FIG. 4) consists of a base 16 which is fastened to the rail 4 in the measuring plane 17. The measuring plane 17 corresponds to the plane which runs on the track 4 perpendicular to the standing surface 10 and parallel to the wheel axis 6. The measuring lever 13 is rotatably connected to the base 16 via a swivel joint 18. At the same time, the measuring lever 13 is supported on the base 16 via a return spring 19. In the swivel joint 18 there is also an angle sensor 20 which determines the respective horizontal position 15 of the measuring roller 14 on the wheel flange 5 in the measuring plane 17.
Die Fig. 5 zeigt das Signal eines Messfühlers 12 über der Zeit bei unterschiedlichen Geschwindigkeiten des Eisenbahnrades 1 in der Bewegungsrichtung 3. Beispielsweise entspricht das Signal 21 einem langsamen Lauf des Eisenbahnrades 1 und die Kurve 22 einem schnellen Lauf des Eisenbahnrades 1. Der Abschnitt 24 in dem Wegzeitdiagramm der Fig. 5 entspricht dem Messweg, welcher von den einzelnen Messfühlern 12 beim Überrollen der Spurkranzkuppe 5 zurück gelegt wird.FIG. 5 shows the signal of a sensor 12 over time at different speeds of the railroad wheel 1 in the direction of movement 3. For example, the signal 21 corresponds to a slow running of the railroad wheel 1 and the curve 22 corresponds to a fast running of the railroad wheel 1. Section 24 in 5 corresponds to the measuring path which is covered by the individual measuring sensors 12 when the wheel flange 5 is rolled over.
In einem der Fig. 5 ähnlichen Wegzeitdiagramm der. Fig. 6 sind eine Mehrzahl von Messkurven 23 über einer Messstrecke 25 nebeneinander angeordnet, wie sie den Signalen 26 der einzelnen Messfühler 12 entsprechen. Wie in der Fig. 6 erkennbar, ist die Messstrecke 25 etwas größer als der Radumfang 27, den ein Eisenbahnrad 1 bei einer einzigen Umdrehung zurücklegt. Wie in der Fig. 6 weiter erkennbar, sind die Signale -26 jeweils unterschiedlich lang. Tangenten, an die Messkurven 23 angelegt, ergeben einen annähernd sinusförmigen Verlauf 28. Dieser Verlauf 28 entspricht der gemessenen Unrundheit des Eisenbahnrades 1 über einem Umfang der Radlauffläche 2. Im vorliegenden Fall hat die Hüllkurve 28 außerdem noch einen Anstieg 29. Der Anstieg 29 stellt die Querbewegung des Eisenbahnrades 1 beim Abrollen auf dem Gleis in Richtung der Drehachse 6 dar.In a path time diagram similar to FIG. 6, a plurality of measurement curves 23 are arranged next to one another over a measurement section 25, as they correspond to the signals 26 of the individual measurement sensors 12. As can be seen in FIG. 6, the measuring section 25 is somewhat larger than the wheel circumference 27, which a railway wheel 1 travels with a single revolution. As can also be seen in FIG. 6, the signals -26 are each of different lengths. Tangents, applied to the measurement curves 23, result in an approximately sinusoidal curve 28. This curve 28 corresponds to the measured out-of-roundness of the railway wheel 1 over a circumference of the wheel tread 2. In the present case, the envelope curve 28 also has an increase 29. The increase 29 represents the Transverse movement of the railway wheel 1 when rolling on the track in the direction of the axis of rotation 6.
Das Messsignal 30 der Fig. 7 zeigt eine Einbuchtung 31. Die Einbuchtung 31 rührt von einer Flachstelle 11 her, welche auf der Lauffläche 2 des Eisenbahnrades 1 ermittelt wurde. Eine isolierte Darstellung 32 der Flachstelle 11 hinsichtlich ihrer Lage und Tiefe auf dem Umfang der Lauffläche 2 ist sodann in der Fig. 8 zu sehen. 2004 0 12The measurement signal 30 of FIG. 7 shows an indentation 31. The indentation 31 originates from a flat point 11, which was determined on the tread 2 of the railway wheel 1. An isolated representation 32 of the flat point 11 with regard to its position and depth on the circumference of the tread 2 can then be seen in FIG. 8. 2004 0 12
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1 Eisenbahnrad1 railway wheel
2 Lauffläche2 tread
3 Laufrichtung3 running direction
4 Schiene4 rails
5 Spurkranz5 wheel flange
6 Drehachse6 axis of rotation
7 Unrundheit7 runout
8 Spurkranzhöhe8 flange height
9 Spurkranzhöhe9 flange height
10 AufStandsfläche10 footprint
11 Flachstelle11 flat spot
12 Messfühler12 sensors
13 Messhebel13 measuring lever
14 Tastrolle14 tracer roller
15 Messweg15 measuring path
16 Basis16 base
17 Messebene17 measurement level
18 Drehgelenk18 swivel
19 Rückholfeder19 return spring
20 Winkelmessgeber20 angle encoders
21 langsamer Lauf21 slow running
22 schneller Lauf22 fast run
23 Messkurven23 measurement curves
24 Messweg24 measuring path
25 Messstrecke25 measuring section
26 Einzelsignal26 single signal
27 Radumfang27 wheel circumference
28 Unrundheit28 Out of roundness
29 Querbewegung29 transverse movement
30 Messsignal30 measurement signal
31 Flachstelle Darstellung Flachstelle Abstand der Messfühler 31 flat spot Representation of flat spot distance of the sensors

Claims

P A T E N T A N S P R Ü C H E PATENT CLAIMS
1. Messeinrichtung an wenigstens einer Schiene eines Eisenbahngleises zum Messen der Rundheit eines einzelnen Eisenbahnrades oder der Eisenbahnräder eines Radsatzes während dessen Laufs über die 'Schiene als Differenz des U fangsradius der Spurkranzkuppe und des Radius der Lauffläche des Eisenbahnrades- in einer Messebene, d a d u r c h g e k e n n z e i c h n e t, dass die Messeinrichtung innerhalb einer Messstrecke (25) entlang der Schiene (4)1. Measuring device on at least one rail of a railway track for measuring the roundness of an individual railway vehicle wheel or the railway wheels of a wheelset during its run over the 'rail as a difference of the U snap radius of the wheel flange and the radius of the running surface of the Eisenbahnrades- in a measurement plane, characterized in that the measuring device within a measuring section (25) along the rail (4)
- aus einer Mehrzahl von einzelnen Messfühlern (12) besteht, die jeweils- consists of a plurality of individual sensors (12), each
- einen seitlichen Abstand (33) voneinander haben und- Have a lateral distance (33) from each other and
- in der Messebene (17) längs der Drehachse (6) des Eisenbahnrades bzw. des Radsatzes und senkrecht zur Aufstandsfläche (10) des jeweiligen Eisenbahnrades- In the measuring plane (17) along the axis of rotation (6) of the railroad wheel or wheel set and perpendicular to the contact surface (10) of the respective railroad wheel
(1) mit der Schiene (4) verbunden sind.(1) are connected to the rail (4).
2. Messeinrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t, dass die Messstrecke (25) zwischen einem und zwei Umfangen der Lauffläche2. Measuring device according to claim 1, d a d u r c h g e k e n n z e i c h n e t that the measuring section (25) between one and two circumferences of the tread
(2) des Eisenbahnrades (1) beträgt.(2) of the railway wheel (1).
3. Messeinrichtung nach den Ansprüchen 1 und 2, d a d u r c h g e k e n n z e i c h n e t, dass innerhalb der Messstrecke (25) wenigstens ein Messfühler (12) die Spurkranzkuppe (5) am Umfang berührt .3. Measuring device according to claims 1 and 2, characterized in that within the measuring section (25) at least one Sensor (12) touches the flange (5) on the circumference.
4. Messeinrichtung nach Anspruch 3, d a d u r c h g e k e n n z e i c h n e t, dass während einer vorgegebenen Messzeit wenigstens zwei angrenzende Messfühler (12) die Spurkranzkuppe (4) am Umfang gleichzeitig berühren.4. Measuring device according to claim 3, so that at least two adjacent sensors (12) simultaneously touch the flange tip (4) on the circumference at the circumference during a predetermined measuring time.
5. Messeinrichtung nach einem der Ansprüche 1 bis 4, d a d u r c h g e k e n n z e i c h n e t, dass jeder Messfühler (12) aus folgenden Elementen besteht:5. Measuring device according to one of claims 1 to 4, d a d u r c h g e k e n n z e i c h n e t that each sensor (12) consists of the following elements:
- einer an der Schiene (4) befestigbaren Basis (16) ,- a base (16) which can be fastened to the rail (4),
- einem Messhebel (13) mit- A measuring lever (13) with
- einer Tastrolle (14) am äußeren Ende,- a feeler roller (14) at the outer end,
- einem Drehgelenkt (18) an der Basis (16) für den Messhebel (12),- a swivel joint (18) on the base (16) for the measuring lever (12),
- einer Rückholfeder (19) zwischen der Tastrolle (12) und dem Drehgelenk (18) und- A return spring (19) between the feeler roller (12) and the swivel joint (18) and
- einem Winkelmessgeber (20) im oder am Drehgelenk (18) .- An angle encoder (20) in or on the swivel (18).
6. Messeinrichtung nach Anspruch 5, d a d u r c h g e k e n n z e i c h n e t, dass ein Kalibrieranschlag vorgesehen ist.6. The measuring device according to claim 5, that a calibration stop is provided.
7. Messeinrichtung nach einem der Ansprüche 1 bis 6, d a du r c h g e k e n n z e i c h n e t, dass eine Auswertungseinrichtung vorgesehen ist, mit der jeder einzelne Messfühler (12) verbindbar ist. 7. Measuring device according to one of claims 1 to 6, since you rchgek characterized in that an evaluation device is provided with which each individual sensor (12) can be connected.
. Messeinrichtung nach Anspruch 7, d a d u r c h g e k e n n z e i c h n e t, dass die Auswertungseinrichtung Untereinrichtungen aufweist zum Ermitteln, Measuring device according to claim 7, d a d u r c h g e k e n n z e i c h n e t that the evaluation device has sub-devices for determining
- der Rundheit (7) des Eisenbahnrades (1) mit genauen Werten in den Messpunkten (23) der Fühler (12) und mit Tangenten in den Messpunkten,- the roundness (7) of the railway wheel (1) with exact values in the measuring points (23) of the sensors (12) and with tangents in the measuring points,
- des Raddurchmessers im Laufkreis der Lauffläche (2),- the wheel diameter in the running circle of the tread (2),
- der Höhe des Spurkranzes (5) in der AufStandsfläche (10) der Lauffläche (2) und- The height of the flange (5) in the standing area (10) of the tread (2) and
- der Anzahl, der Lage und jeweiligen Tiefe von Flachstellen (11) in der Lauffläche (2) .- The number, location and respective depth of flat spots (11) in the tread (2).
9. Messeinrichtung nach Anspruch 8, d a d u r c h g e k e n n z e i c h n e t, dass die9. Measuring device according to claim 8, d a d u r c h g e k e n n z e i c h n e t that the
Auswertungseinrichtung eine Untereinrichtung aufweist zur Ermittlung des Querversatzes (29) des Eisenbahnrades (1) bzw. der Eisenbahnräder (1) eines Radsatzes beim Durchlaufen (3) des Messstrecke (25) .Evaluation device has a sub-device for determining the transverse offset (29) of the railroad wheel (1) or the railroad wheels (1) of a wheel set when passing through (3) the measuring section (25).
10. Messeinrichtung nach Anspruch 8, d a d u r c h g e k e n n z e i c h n e t, dass die10. Measuring device according to claim 8, d a d u r c h g e k e n n z e i c h n e t that the
Auswertungseinrichtung eine Untereinrichtung aufweist welche rekursiv den Durchmesser des EisenbahnradesEvaluation device has a sub-device which recursively the diameter of the railway wheel
(1) bzw. der Eisenbahnräder (1) eines Radsatzes mit einer gemessenen Abweichung (7) von der Rundheit des jeweiligen Eisenbahnrades (1) korrigiert.(1) or the railway wheels (1) of a wheelset with a measured deviation (7) from the roundness of the respective railway wheel (1) corrected.
11. Messeinrichtung nach Anspruch 5, d a d u r c h g e k e n n z e i c h n e t, dass an der Tastrolle (14) ein Schmutzabstreifer vorgesehen ist. 11. Measuring device according to claim 5, so that a dirt wiper is provided on the sensing roller (14).
PCT/EP2003/014480 2002-12-23 2003-12-18 Device for measuring the roundness of a railroad wheel WO2004058554A1 (en)

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AU2003300532A AU2003300532A1 (en) 2002-12-23 2003-12-18 Device for measuring the roundness of a railroad wheel
US10/540,343 US7392595B2 (en) 2002-12-23 2003-12-18 Device for measuring the roundness of a railroad wheel
DE50304173T DE50304173D1 (en) 2002-12-23 2003-12-18 MEASURING DEVICE FOR MEASURING THE ROUNDNESS OF A RAILWAY WHEEL
EP03813898A EP1575816B1 (en) 2002-12-23 2003-12-18 Device for measuring the roundness of a railroad wheel

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DE10260816A DE10260816B4 (en) 2002-12-23 2002-12-23 Measuring device for measuring the roundness of a railway wheel
DE10260816.4 2002-12-23

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EP (1) EP1575816B1 (en)
KR (1) KR101004782B1 (en)
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AU (1) AU2003300532A1 (en)
DE (2) DE10260816B4 (en)
ES (1) ES2268494T3 (en)
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DE50304173D1 (en) 2006-08-17
ES2268494T3 (en) 2007-03-16
AU2003300532A1 (en) 2004-07-22
EP1575816B1 (en) 2006-07-05
DE10260816A1 (en) 2004-07-15
EP1575816A1 (en) 2005-09-21
TWI318945B (en) 2010-01-01
KR20050092375A (en) 2005-09-21
KR101004782B1 (en) 2011-01-04
CN1780752A (en) 2006-05-31
DE10260816B4 (en) 2007-04-12
US7392595B2 (en) 2008-07-01
TW200427601A (en) 2004-12-16
CN100376444C (en) 2008-03-26

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